Patents by Inventor Naohisa Aoki

Naohisa Aoki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Moving-coil type pickup cartridge
    Patent number: 4488284
    Abstract: In a moving-coil type pickup cartridge, a vibrating system including an armature wound with a coil is disposed at an open end area of a magnet with a damper being interposed between the armature and the magnet, and the armature is placed directly under the influence of magnetic flux produced between the one and other ends of the magnet for generating a voltage without using any yoke.
    Type: Grant
    Filed: September 30, 1982
    Date of Patent: December 11, 1984
    Assignee: Nippon Columbia Co., Ltd.
    Inventors: Naohisa Aoki, Akira Matuki
  • Moving coil type pickup cartridge
    Patent number: 4455639
    Abstract: In a moving-coil type pickup cartridge, a vibrating system including an armature wound with a coil is disposed at an open end area of a magnet with a damper being interposed between the armature and the magnet, and the armature is placed directly under the influence of magnetic flux produced between the ends of the magnet for generating a voltage without using any yoke. The magnet is a hollow cylinder having its interior free of any other magnet material.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: June 19, 1984
    Assignee: Nippon Columbia Company, Ltd.
    Inventors: Naohisa Aoki, Akira Matui
  • Pickup tone arm
    Patent number: 4101133
    Abstract: This invention relates to a complex resonance type pickup tone arm in which a damping member is disposed at the middle of the arm to damp low and middle frequency resonances so that the tip of the arm is prevented from being bent down.
    Type: Grant
    Filed: October 13, 1976
    Date of Patent: July 18, 1978
    Assignee: Nippon Columbia Kabushikikaisha (Nippon Columbia Co., Ltd.)
    Inventors: Naohisa Aoki, Hitoshi Matsuda, Hideaki Hayashi